Note: Different antibodies work better with different permeabilization. Try both and see which works best for your specific antibody.

Blocking Solution - 5% Normal Horse Serum in PBS

PROCEDURE:

Fixation

Make Fixing Buffer: Work under the fume hood. Add 1.0 g dry 97% Paraformaldehyde to the 20 mL aliquot of non-sterile 1xPBS in a 50 mL conical tube. Add 25 μL 10M NaOH. Cap the tube, seal with parafilm, and heat at 60°C with occasional shaking until the paraformaldehyde dissolves. Cool the solution to room temperature (or chill in the refrigerator) before use.

Do the following in the TC room in the biosafety cabinet: Remove medium from the cells. Add 0.5 mL warm Sterile 1x PBS to each well.

Take the plate to your bench.

Remove the 1xPBS from the cells.

Work under the fume hood: Add 0.5 mL freshly made Fixing Buffer to each well. Incubate at Room Tmp./ 10 minutes.

Remove the Fixing Buffer. Add 0.5 mL Permeabilization Solution to each well and incubate at room temp. for 10 min.

Note: This is a stopping point. You can place a lid on the plate, seal it with parafilm, and store the cells +1xPBS at 4°C for several days. Or, proceed immediately to Antibody Staining.

Antibody Staining

Block in 250 μL Blocking Solution for at least one hour at Rm. Tmp. (can incubate overnight at 4°C if necessary).

Dilute primary antibody (according to supplier’s instructions) in 5% NHS. Add 15 μl to each cover slip and cover with a 1 cm2 piece of parafilm. Incubate at Room Tmp. for at least one hour in a humidified box (can incubate overnight at 4°C if necessary).

Add diluted secondary to samples (same way as primary) and incubate at Room Tmp. for one hour. Protect the samples from light; fluorophores are light-sensitive.

Wash 3 – 4 times/ 5 min. with PBS.

Mounted Slides

Mounting and Storage
12. Place a small drop of Vinol Mounting Medium onto a clean slide.
13. Invert a cover slip, cell side down, onto the medium and press gently.
14. Blot excess mounting medium with a Kimwipe (be careful not to slide the cover slip out of place).
15. Rinse briefly with distilled water and blot dry.
16. Slides are best viewed after allowing the mounting medium to set overnight (at Room Tmp., protected from light); slides may be viewed immediately if handled carefully.
17. Slides may be stored indefinitely at Rm. Tmp. (morphology is preserved)